ncontrol argument in random_steps is ignored

[mariusgrabow]

Hi Johannes,

recently, I found that the ncontrol argument in random_steps is ignored (always using 10 random steps, the default, instead of the specified number). Reproducible example below.

Best

Marius

fisher<-amt::amt_fisher%>%
make_track(x_,y_,t_,id=id)%>%
nest(data= -id)%>%
mutate(data = map(
data, ~ track_resample(.x,
rate=hours(1),
tolerance=minutes(5))))%>%
mutate(
data = map(data, ~steps_by_burst(.x,keep_cols="end")),
data = map(data, ~random_steps(.x,ncontrol=20)))%>% #completely ignored, no matter which number i use
unnest(cols = data)

sessionInfo()

R version 4.3.3 (2024-02-29 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19045)

Matrix products: default

locale:
[1] LC_COLLATE=English_United Kingdom.utf8 LC_CTYPE=English_United Kingdom.utf8 LC_MONETARY=English_United Kingdom.utf8
[4] LC_NUMERIC=C LC_TIME=English_United Kingdom.utf8

time zone: Europe/Berlin
tzcode source: internal

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] glmmTMB_1.1.9 broom_1.0.5 here_1.0.1 sf_1.0-16 amt_0.3.0.0 terra_1.7-71 lubridate_1.9.3
[8] forcats_1.0.0 stringr_1.5.1 dplyr_1.1.4 purrr_1.0.2 readr_2.1.5 tidyr_1.3.1 tibble_3.2.1
[15] ggplot2_3.5.0 tidyverse_2.0.0

loaded via a namespace (and not attached):
[1] DBI_1.2.2 Rdpack_2.6.1 remotes_2.5.0 sandwich_3.1-0 rlang_1.1.3 magrittr_2.0.3
[7] multcomp_1.4-25 furrr_0.3.1 e1071_1.7-14 compiler_4.3.3 d6atlas_0.0.0.9000 mgcv_1.9-1
[13] vctrs_0.6.5 profvis_0.3.8 pkgconfig_2.0.3 fastmap_1.1.1 backports_1.4.1 ellipsis_0.3.2
[19] utf8_1.2.4 promises_1.3.0 rmarkdown_2.26 sessioninfo_1.2.2 tzdb_0.4.0 nloptr_2.0.3
[25] xfun_0.43 cachem_1.0.8 later_1.3.2 parallel_4.3.3 R6_2.5.1 stringi_1.8.3
[31] parallelly_1.37.1 boot_1.3-30 pkgload_1.3.4 numDeriv_2016.8-1.1 estimability_1.5 Rcpp_1.0.12
[37] knitr_1.46 usethis_2.2.3 zoo_1.8-12 httpuv_1.6.15 Matrix_1.6-5 splines_4.3.3
[43] timechange_0.3.0 tidyselect_1.2.1 rstudioapi_0.16.0 yaml_2.3.8 TMB_1.9.11 codetools_0.2-20
[49] miniUI_0.1.1.1 listenv_0.9.1 pkgbuild_1.4.4 lattice_0.22-6 shiny_1.8.1.1 withr_3.0.0
[55] coda_0.19-4.1 evaluate_0.23 future_1.33.2 desc_1.4.3 survival_3.5-8 units_0.8-5
[61] proxy_0.4-27 urlchecker_1.0.1 fitdistrplus_1.1-11 circular_0.5-0 pillar_1.9.0 KernSmooth_2.23-22
[67] checkmate_2.3.1 generics_0.1.3 rprojroot_2.0.4 hms_1.1.3 munsell_0.5.1 scales_1.3.0
[73] minqa_1.2.6 globals_0.16.3 xtable_1.8-4 class_7.3-22 glue_1.7.0 emmeans_1.10.1
[79] tools_4.3.3 data.table_1.15.4 lme4_1.1-35.2 fs_1.6.3 mvtnorm_1.2-4 grid_4.3.3
[85] rbibutils_2.2.16 devtools_2.4.5 colorspace_2.1-0 nlme_3.1-164 ggspatial_1.1.9 cli_3.6.2
[91] fansi_1.0.6 d6_0.1.0.4 gtable_0.3.4 broom.mixed_0.2.9.5 digest_0.6.35 classInt_0.4-10
[97] TH.data_1.1-2 htmlwidgets_1.6.4 memoise_2.0.1 htmltools_0.5.8.1 lifecycle_1.0.4 mime_0.12

[jmsigner]

Thanks for reporting. Could you try with n_control = 20. This worked for me.